tndbaux.c - plan9port - [fork] Plan 9 from user space
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       ---
       tndbaux.c (1503B)
       ---
            1 #include <u.h>
            2 #include <libc.h>
            3 #include <bio.h>
            4 #include <ctype.h>
            5 #include <ndb.h>
            6 #include "ndbhf.h"
            7 
            8 
            9 /*
           10  *  parse a single tuple
           11  */
           12 char*
           13 _ndbparsetuple(char *cp, Ndbtuple **tp)
           14 {
           15         char *p;
           16         int len;
           17         Ndbtuple *t;
           18 
           19         /* a '#' starts a comment lasting till new line */
           20         EATWHITE(cp);
           21         if(*cp == '#' || *cp == '\n')
           22                 return 0;
           23 
           24         t = ndbnew(nil, nil);
           25         setmalloctag(t, getcallerpc(&cp));
           26         *tp = t;
           27 
           28         /* parse attribute */
           29         p = cp;
           30         while(*cp != '=' && !ISWHITE(*cp) && *cp != '\n')
           31                 cp++;
           32         len = cp - p;
           33         if(len >= Ndbalen)
           34                 len = Ndbalen-1;
           35         strncpy(t->attr, p, len);
           36 
           37         /* parse value */
           38         EATWHITE(cp);
           39         if(*cp == '='){
           40                 cp++;
           41                 if(*cp == '"'){
           42                         p = ++cp;
           43                         while(*cp != '\n' && *cp != '"')
           44                                 cp++;
           45                         len = cp - p;
           46                         if(*cp == '"')
           47                                 cp++;
           48                 } else if(*cp == '#'){
           49                         len = 0;
           50                 } else {
           51                         p = cp;
           52                         while(!ISWHITE(*cp) && *cp != '\n')
           53                                 cp++;
           54                         len = cp - p;
           55                 }
           56                 ndbsetval(t, p, len);
           57         }
           58 
           59         return cp;
           60 }
           61 
           62 /*
           63  *  parse all tuples in a line.  we assume that the
           64  *  line ends in a '\n'.
           65  *
           66  *  the tuples are linked as a list using ->entry and
           67  *  as a ring using ->line.
           68  */
           69 Ndbtuple*
           70 _ndbparseline(char *cp)
           71 {
           72         Ndbtuple *t;
           73         Ndbtuple *first, *last;
           74 
           75         first = last = 0;
           76         while(*cp != '#' && *cp != '\n'){
           77                 t = 0;
           78                 cp = _ndbparsetuple(cp, &t);
           79                 if(cp == 0)
           80                         break;
           81                 if(first){
           82                         last->line = t;
           83                         last->entry = t;
           84                 } else
           85                         first = t;
           86                 last = t;
           87                 t->line = 0;
           88                 t->entry = 0;
           89         }
           90         if(first)
           91                 last->line = first;
           92         setmalloctag(first, getcallerpc(&cp));
           93         return first;
           94 }